Valve mechanism for air pumps and the like



March 5, 1929. PFElFER 1,704,513

VALVE MECHANISM FOR AIR PUMPS AND THE- LIKE Filed Feb. 5, 192;

1 a E "J 8 35 6 flinlm i 9 II I s\ Patented Mar. 5, 1929.

' UN STAT y g Y 1,204,513 are GEORGE F. rnnrrna, or aIvnnsInn, ILLINOIS, nssreivon'ro 'QUiNCY oomnansso n. r 00., or-auIIvcY, ILLINOIS, A CORPORATION on ILLINOIS; I

Application filed February 3, 1923. Serial No. 616,676.

My invention relates to cylinder heads and valve mechanisms for pumps, compressors, engines and similar devices, and is particularly useful in connection with an pumps such for example as used with cow-milking apparatus. 7 p p The general object of the inventlon 1s to provide a new and improved cyhnder head and valve mechanism which is simple 1n con 19 struction, efiicie'nt in operation, cheap to manufacture and easily assembled and dismantled. One of the specific objects of the invention is to provide a cylinder head and valve mechanism such that the possibility of any part of 1 the valve mechanism falling into the cylinder,

in case such part becomes detached through breakage or otherwise, is reduced to a m nimum. This is an lmportant matter, Inasmuch as the clearance between theend'of a pump piston and the cylinder head is usually so small that in case. loose parts drop into the cylinder serious damage to the machine results. 1

The invention will be understood from the following description taken in connect on with the accompanying drawing in wh ch Figure. 1 is'a sectional elevation of a port on of the pump having the invention embodied therein .and Figure 2 is a sectional plan View onthe line 22 ofFigure 1. V 7

Referring to the drawing, at 4 is shown a piston located with an airpump cyhnder 5, both these parts being only partlally shown. The cylinder 5 is provided with hollow proj ections 7 and 9, adapted to serve as the intake and outlet. passages of the pump. The outside vertical walls of these hollow pro ections 7 and 9 are shown as provided with threaded. holes into which pipes may be screwed; and

the top walls of said projections are provided with openings 11 and 12 adapted to communi- 'cate with openings through a valve plate 14 into intake and outlet valve chambers formed between said valve plate '14 and a cover 16, as

hereinafter described. The top. of the cylinder 5 is machined to a plain surface, and is adapted to be engaged by the valve plate 14, a gasket being preferably introduced between these two parts. The valve plate 14, which also serves as the cylinder head, has parallel machined faces and one face has an annular recess and an annular valve seat with which at its bottom with opening 15 extending through the valve plate; and the top of-said recess is covered with a cover plate 17 having ports therein. Said cover plate 17 which is machined on its bottom surface, is secured'to the valve plate 14 by means of a stud 18 screwed into the valve plate 14 and extending through the hub of the cover plate 17 and provided at its upper end with anut 19 which may besecured from working off of said stud by means of a cotter-pin 20. Cooperating with the bottom of the cover plate 17, is a valve 22in the form of a flatring, this valve being yieldingly held in a position to close the openings through the cover plate 17 by means of a coiled wire spring 24. The valve 22 and thespring 24 may be held from lateral movement by means; of radial lugs 25 extending outwardly into the annular recess in which the valve 22 and the spring 24 are located.

The valve at the right'side of both figures of the drawing is the outlet valve of the pump. The valve seat for this valve mechanism is provided by machining, an annular portion of the top surface ofthe valve plate 14 at a said plate which serve as valve ports. These valve ports 28 are closed by a valve 29, in the form of a fiat ring like the ring 22 used in the inlet valve; and this valve 29 is yieldingly held in its closed posit-ion by means of a coiled spring 30, said valve and spring being .held against lateral movement by lugs 32 projecting outwardly from an upwardly extending portion 33 of the valve plate 14. The coiled spring 30 is held under compression by wings 35 cast in the cover 16, which is adapted to cooperate with the top of the valve plate'14; The cover 16 is provided with'a transversely extending rib 88 which'makes contact with a rib 39 extending across the top of the valve plate 14, and said rib 38 thus serves to divide the space between the valve plate 14 and the cover 16 into an intake valve chamber and an outlet valve chamber, as will be obvious from the drawing.

It will be noted that all of the separate parts of the valve mechanisms are located onthe side of the valve plate 14 opposite the cylinder, thereby avoiding the possibility of any of the parts ofthe valve mechanism dropping into the cylinder should said parts become detached for any reason.

While I have shown one form in which my invention may be embodied, it is my intention 80 portion where there are openings 28 through V the same side or the plate as said recess, valve mechanism located in said recess and on said valve seat, a valve seat member attached to said plate over said annular recess so as to form aseat for the valve contained ther in,

and a cover adapted to cooperatewith that face of said plate whichis providedwith said recess and valveseat and so'iormed as'to provide two separate'valve chambers, one of said chambers containing said valve seat member andf the other chamber having formed therein a stop member adapted to overlie thevalve mechanism on said annular valve seat so that when'said cover is applied it will retain said last named valve mechanism in position withrespect to its seat.

2. In a device of the character described, a valve plate having anannular valve seat from which ports extend thru said plate, a valve cooperating with said valve seat and adapted to cover saidports, a spring engaging said has valve for yieldingly holding said valve in its closed position, and an imperforate cover mounted directly on the'valve plate and conjointly therewith forming a valve chamber and holding the spring in compression.

3. In a device of the character described, a valve plate having an annular valve seat from which ports extend thru said plate, a valve cooperating with said valve seat and adapted to cover said ports, a spring engaging said valve for yieldingly holding said valve in its closed position, and a cover mounted directly on the valve plate and cooperating with said valve plate to form a valve chamber, said cover having means cooperating with said spring and putting the latter under compression.

4. Ina device of the character described, a valve plate having an annular valve seat from which ports extend thru said plate, a valve. cooperating with said valve seat and adapted to cover said ports, a spring engaging said valve for yieldingly holding said vvalve in its closed position, and a cover, mounted directly on the valve plate and adapted to cooperate with'said valve plate and form a valve chamberan'd having wings projecting into said chamber and cooperating with said spring whereby the latter is put un- 6. In acy'linder head construction for pumping mechanism, in combination, a valve plate adapted to cover an end of a'cyllnder,

and having intakeand outlet channelsthere' through, said valve plate also having inlet and outlet passages adapted for communication with the cylinder,inlet and outlet valves carried by the valve plate, and a; cover coextensive with the valve plate, said cover having a partition between the valves divid ing the space between the valve plate and the r cover into inlet and outlet chambers.

7. In a cylinder head construction for pumping mechanism, in combination, a valve plate adapted to cover an end-or a cylinder and having port-ions adapted to project. out

beyond the cylinder, said valve plate also having intake and outlet channelsfextending through said outwardly projecting portions, and inlet and outlet passages adapted for communication with the cylinder, inletand outlet valves carried by the valve plate for controlling said passages, a cover co-exten sive with the valve plate, and a partition di vidingthe space between the valve plate and the cover into inlet and outlet chambers.

8. In a cylinder head construction for .r

pumping mechanism, in combination, a flat, plane surfaced valve plate adapted to cover a cylinder end and to project outward beyond the cylinder, and having intake and outlet channels through marginal portions thereof, 7

said valve plate also having intake and outlet passages adapted for communication with the cylinder, valves associated with the latter passages, and a'dome-shaped cover having a partition dividing the cover to form intake and outlet chambers, said cover terminating marginally in a single plane to fit the margin of the valve plate. i I In testimony whereof I have afiixed my signature to this specification.

GEORGE PFEIFER.

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